HOP 0079

plan term

2008/08/18-2008/08/24
2008/09/17-2008/09/18
2008/10/24-2008/10/25
2008/11/18-2008/11/19
2008/12/17-2008/12/18
2009/01/23-2009/01/24
2009/02/17-2009/02/18
2009/03/24-2009/03/25
2009/04/11-2009/04/12
2009/05/20-2009/05/20
2009/05/26-2009/05/26
2009/06/20-2009/06/20
2009/07/30-2009/07/30
2009/09/01-2009/09/01
2009/09/03-2009/09/03
2009/10/01-2009/10/01
2009/10/03-2009/10/03
2009/11/03-2009/11/03
2009/11/05-2009/11/05
2009/11/29-2009/11/30
2009/12/20-2009/12/20
2009/12/22-2009/12/22
2010/01/31-2010/01/31
2010/02/02-2010/02/02
2010/02/23-2010/02/23
2010/02/25-2010/02/25
2010/03/30-2010/03/31
2010/04/26-2010/04/28
2010/05/30-2010/05/30
2010/06/01-2010/06/01
2010/07/01-2010/07/01
2010/07/03-2010/07/03
2010/07/29-2010/07/29
2010/07/31-2010/07/31
2010/08/31-2010/08/31
2010/09/02-2010/09/01
2010/09/30-2010/09/30
2010/10/05-2010/10/05
2010/11/10-2010/11/11
2010/12/01-2010/12/02
2011/01/05-2011/01/06
2011/02/02-2011/02/03
2011/03/03-2011/03/03
2011/05/03-2011/05/03
2011/05/05-2011/05/05
2011/05/31-2011/05/31
2011/06/02-2011/06/02
2011/06/30-2011/06/30
2011/07/02-2011/07/02
2011/08/02-2011/08/02
2011/08/04-2011/08/04
2011/09/06-2011/09/06
2011/09/08-2011/09/08
2011/10/25-2011/10/25
2011/10/27-2011/10/27
2011/11/29-2011/11/29
2011/12/01-2011/12/01
2011/12/27-2011/12/27
2011/12/29-2011/12/29
2012/01/31-2012/01/31
2012/02/02-2012/02/02
2012/02/28-2012/02/28
2012/03/01-2012/03/01
2012/03/29-2012/03/29
2012/03/31-2012/03/31
2012/05/01-2012/05/01
2012/05/03-2012/05/03
2012/05/22-2012/05/22
2012/05/24-2012/05/24
2012/06/26-2012/06/26
2012/06/28-2012/06/28
2012/07/26-2012/07/26
2012/07/28-2012/07/28
2012/08/26-2012/08/26
2012/08/28-2012/08/28
2012/09/18-2012/09/18
2012/09/20-2012/09/20
2012/10/16-2012/10/16
2012/10/18-2012/10/18
2012/11/20-2012/11/20
2012/11/22-2012/11/22
2012/12/18-2012/12/18
2012/12/20-2012/12/20
2013/01/22-2013/01/22
2013/01/24-2013/01/24
2013/02/19-2013/02/19
2013/02/21-2013/02/21
2013/03/26-2013/03/26
2013/03/28-2013/03/28
2013/04/23-2013/04/23
2013/04/25-2013/04/25
2013/05/28-2013/05/28
2013/05/30-2013/05/30
2013/06/25-2013/05/25
2013/06/27-2013/05/27
2013/07/03-2013/07/03
2013/07/05-2013/07/05
2013/07/30-2013/07/30
2013/08/01-2013/08/01
2013/08/20-2013/08/20
2013/08/22-2013/08/22
2013/09/18-2013/09/18
2013/09/20-2013/09/20
2013/10/23-2013/10/23
2013/10/25-2013/10/25
2013/11/20-2013/11/20
2013/11/22-2013/11/22
2013/12/25-2013/12/25
2013/12/27-2013/12/27
2014/01/17-2014/01/17
2014/01/24-2014/01/24
2014/02/11-2014/02/11
2014/02/13-2014/02/13
2014/03/18-2014/03/18
2014/03/20-2014/03/20
2014/04/15-2014/04/15
2014/04/17-2014/04/17
2014/05/20-2014/05/20
2014/05/22-2014/05/22
2014/07/22-2014/07/22
2014/07/24-2014/07/24
2014/08/19-2014/08/19
2014/08/21-2014/08/21
2014/09/23-2014/09/23
2014/09/25-2014/09/25
2014/10/21-2014/10/21
2014/10/23-2014/10/23
2014/11/25-2014/11/25
2014/11/27-2014/11/27
2015/01/06-2015/01/06
2015/01/08-2015/01/08
2015/02/15-2015/02/15
2015/02/17-2015/02/17
2015/03/18-2015/03/18
2015/03/20-2015/03/20
2015/04/21-2015/04/21
2015/04/23-2015/04/23
2015/05/19-2015/05/19
2015/05/24-2015/05/24
2015/06/18-2015/06/18
2015/06/20-2015/06/20
2015/07/16-2015/07/16
2015/07/18-2015/07/18
2015/08/13-2015/08/13
2015/08/15-2015/08/15
2015/09/15-2015/09/15
2015/09/17-2015/09/17
2015/10/13-2015/10/13
2015/10/15-2015/10/15
2015/11/17-2015/11/17
2015/11/19-2015/11/19
2015/12/15-2015/12/15
2015/12/17-2015/12/17
2016/01/14-2016/01/14
2016/01/17-2016/01/17
2016/02/16-2016/02/16
2016/02/18-2016/02/18
2016/03/22-2016/03/22
2016/03/24-2016/03/24
2016/04/19-2016/04/19
2016/05/12-2016/05/12
2016/06/23-2016/06/23
2016/07/21-2016/07/21
2016/08/25-2016/08/25
2016/09/15-2016/09/15
2016/10/13-2016/10/13
2016/11/15-2016/11/15
2016/12/20-2016/12/20
2017/01/19-2017/01/19
2017/02/19-2017/02/19
2017/03/16-2017/03/16
2017/04/13-2017/04/13
2017/05/18-2017/05/18
2017/06/15-2017/06/15
2017/07/13-2017/07/13
2017/08/17-2017/08/17
2017/09/14-2017/09/14
2017/10/19-2017/10/19
2017/11/23-2017/11/23
2017/12/14-2017/12/14
2018/01/11-2018/01/11
2018/02/13-2018/02/13
2018/03/13-2018/03/13
2018/04/12-2018/04/12
2018/05/17-2018/05/17
2018/06/14-2018/06/14
2018/07/12-2018/07/12
2018/08/16-2018/08/16
2018/09/13-2018/09/13
2018/10/18-2018/10/18
2018/11/15-2018/11/15
2018/12/13-2018/12/13
2019/01/10-2019/01/10
2019/02/14-2019/02/14
2019/03/14-2019/03/14
2019/04/23-2019/04/23
2019/05/16-2019/05/16
2019/06/13-2019/06/13
2019/07/11-2019/07/11
2019/08/15-2019/08/15
2019/09/10-2019/09/10
2019/10/21-2019/10/21
2019/11/28-2019/11/28
2019/12/13-2019/12/13
2020/01/10-2020/01/10
2020/02/20-2020/02/20
2020/03/19-2020/03/19
2020/04/16-2020/04/16
2020/05/19-2020/05/19
2020/06/23-2020/06/23
2020/07/16-2020/07/16
2020/08/13-2020/08/13
2020/09/17-2020/09/17
2020/10/14-2020/10/14
2020/11/12-2020/11/12
2021/01/14-2021/01/14

abstract of observational proposal

Scientific background:
The total solar irradiance varies by about 0.1% over the course of the solar cycle, primarily due to the influence of magnetic structures such as sunspots and faculae on the photospheric spectral irradiance. Short-term irradiance variation (on the scale of days-to-months) is well understood to be due to the balance of sunspots and facular areas as they cross the disk. However on the decadal scale of the solar cycle, questions remain as to why the irradiance variation can lead and/or lag the active region count over the course of the cycle. Explanations ranging from changes in the solar diameter in response to magnetic flux storage in the convection zone to changes in the surface area of the photosphere due to F-mode modulation have been put forward. Seeing-free observations of both granulation and magnetic flux on a large range of scales are now possible with the SOT SP/FG instrument combination. We propose to observe with SOT on a regular basis throughout the rise of Cycle 24 in order to better understand the variation of irradiance with rising flux levels in the photosphere. On 07-March-2007 we performed a test program which produced a N-S scan of the central meridian with full SP normal maps at 12 positions. In a separate program (08-March-2007) we produced E-W scans of the +15 and -15 deg. latitude "active region" belts with BFI continuum filtergrams and NFI Fe I 630.25 nm magnetograms. Both of these programs produced unique data that are not possible to obtain from any other visible light solar instrument. If performed on a regular basis and ultimately analyzed with the data from the total irradiance measurement satellites such as ACRIM and SORCE, these observations have the potential to reveal new and important aspects of the relation between solar irradiance and magnetic flux emergence over the solar cycle.

In addition, work by Shiozu and Tsuneta has shown that HOP 79 N-S scan scan data can be used to infer the latitudinal temperature variation between the equator and the poles thus offering constraints on "thermal wind" theories of convection zone rotational profiles. This finding has prompted a change in the E-W pointing scans to include a disk-center scan in order to better calibrate the N-S scans (see Remarks section below).

request to EIS

This is a new EIS program submitted by Kamio-san in December 2009:

HOP79 is originally intended for long term variation of solar irradiance measurement and provides an ideal framework for studying center-to-limb variation of Doppler shfit. Net Doppler shifts reported in previous papers indicate that transition region emissions (105K) are red-shifted up to +10 km s¡1 while coronal emissions (106K) are slightly blue-shifted or almost at rest. EIS will allow precise measurement of coronal emissions. This modification will increase the value of HOP79 while keeping its current scheme.

New request for EIS includes spectra as well as slot images. Two studies should
be run at each pointing in HOP79. For the N-S scan, please run

* Study #375 SK DEEP 5x512 SLIT1
Slit scan covering 5”x512”
Data volume: 7Mbits in 11min

* Study #354 PRY slot contextLITE
A composite image of 488”x488” in He II ¸256
Data volume: 2.4Mbits in 4min

For the E-W scan please run

* Study #375 SK DEEP 10x512 SLIT2
Slit scan covering 10"x512”
5min

* Study #354 PRY slot contextLITE
A composite image of 488”x488” in He II ¸256
Data volume: 2.4Mbits in 4min

If two studies can not be accommodated at each pointing due to telemetry
shortage or time allocation, they can be run in alternate manner.

pointing #1 SK DEEP 5x512 SLIT1
pointing #2 PRY slot contextLITE
pointing #3 SK DEEP 5x512 SLIT1
pointing #4 PRY slot contextLITE
...

remarks

Note: this HOP is done regardless of solar activity - it is *not* a quiet Sun HOP and it is acceptable to include active regions in the view fields.

Pointing:
N-S meridian scan requires about 20 pointings to cover the solar diam.

The E-W latitude scans each require about 13 pointings.
Note: as of November 2009 we now alternate the +/- 15 deg. latitude scans
with a disk-equator scan. Therefor the E-W scan schedule is now as
follows:

Jan 2016: -15 deg latitude and scan across disk center.
Feb 2016: +15 deg latitude and scan across disk center.
Mar 2016: -15 deg...etc.

Check the Google calendar to make sure the correct latitude is being scanned. Click on the green bar in the calendar and the "details" section should show which latitude is scheduled to be run. To be absolutely sure, check the timeline for the previous month.

Duration:
Program 1: ~10 hours (about 30 minutes at each pointing for completion of the SP normal map plus overhead).

Program 2: ~6 hours (about 15 minutes at each position of the E-W scans). Note that the duration of these scan positions can be shortened to as little as 10 minutes if EIS and XRT do not take any data for the program.

N-S scans: avoid SAA periods for SP integrity
E-W scans: avoid SAA periods at planner's convenience
Use the program get_pnt_times.pro by Greg Slater to get SAA-free pointing times to give to CP at daily meeting.

Example calls for EW scans:

get_pnt_times,'9-feb-2016', lat=15, ts_win='10-feb-2016 18:30', /bfi
get_pnt_times,'9-feb-2016', /horizontal, ts_win='9-feb-2016 16:00', /bfi

For NS scans, the following are equivalent:

get_pnt_times,'9-feb-2016', lon=0, ts_win='11-feb-2016 04:30', /bfi
hop79ns,'9-feb-2016', ts_win='11-feb-2016 04:30'

(edited on 2016 Feb. 10)